Sunday, October 9, 2011

Life of Spiny Dogfish

Life of Sea | Spiny Dogfish (Squalus acanthias) | The Spiny dogfish, Spurdog, Mud shark, or Piked dogfish, is one of the best known of thedogfish, which are members of the family Squalidae are in the order Squaliformes. Though these common names apply to different species, Spiny dogfish is distinguished by having two spines (one anterior to each dorsal fin) and lacks an anal fin. It occurs mainly in shallow waters and further offshore in most parts of the world, especially in temperate waters. This shark is present in all the world's temperate oceans It ranges in the coastal waters of the Atlantic and Pacific. The dogfish is a seasonal migrant into Canadian waters.

Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Chondrichthyes
Subclass:     Elasmobranchii
Order:     Squaliformes
Family:     Squalidae
Genus:     Squalus
Species:     S. acanthias
The Spiny dogfish is a shark that small dark gray with some white spots, the belly is off-white. It had two dorsal fins, each preceded by a slightly poisonous spider. It has a short snout, large eyes and no anal fin. The Spiny dogfish is a small school groups of hundreds or thousands of same-sex shapes and sizes. This shark is gray or brownish on top and light gray or white on its ventral side with irregular white spots on the top or side of the body. The second dorsal fin is smaller than the first and both fins have spines on their origin. The caudal fin is asymmetrical with the upper lobe is larger. The smooth edges short and oblique teeth are similar in both the upper and lower jaw. The spiny dogfish has an estimated life of 25 to 30 years.

The Spiny dogfish is an opportunistic feeder eat whatever prey is abundant. In general, their diet consists of small fish such as capelin, cod, haddock, hake, herring, menhaden and ratfish. They also eat invertebrates such as krill, crabs, polychaete worms, jellyfish, ctenophores, amphipods, squid and octopus.

Spiny dogfish are not considered dangerous, but some damage can be done through their teeth and their poisonous dorsal spines light. Spiny dogfish are gregarious (social) and travel in schools of hundreds to thousands of individuals. These schools are sometimes separated by gender and age. They are called dogfish because they travel and hunt in packs. They migrate in schools, after cool water.

Spiny dogfish are caught for food in Europe, the United States, Canada, New Zealand and Chile. The meat is mainly in England, France, Benelux and Germany. The fins and tail fin are processed into needles and are used in less expensive versions of shark fin soup in Chinese cuisine. In England these are sold in dogfish and other fish and chip shops as "rock salmon" or "Huss", in France it is sold as "little salmon" in Belgium and Germany and is sold as "sea eel". It is also used as fertilizer, liver, and pet food, and because of the availability, cartilage skull, and the manageable size, as a popular vertebrate dissection specimen, in both high schools and universities.

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